{"id":"55113133-dee3-4630-9d50-b0c5c5291cf9","shortId":"qKsc9j","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/products/44` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals) — equivalent to $0.02 per request. No API keys, rate limits, or upfront commitments are required; callers simply attach an x402 payment header to each POST request.\n\nThe broader platform advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request and settle in USDC on the Base L2 network.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to know what request body to send or what response shape to expect for this particular product endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The purpose and expected input/output of /api/v1/products/44 specifically is unclear — 'Premium API Access' is a generic label","No rate limit, SLA, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/44","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The /docs and other pages are empty. The specific purpose of /api/v1/products/44 ('Premium API Access') is vague and 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'/api/v1/products/44':63 '/call':19,38 '/docs':183 '/pricing':185 '/readme':187 '0.02':18,37,91,162 '000':78 '0x8335':83 '20':77 '2913':84 '402':226 '402 payment api' '6':87 'access':50,69 'advertis':118 'ai':12,31,130 'ai-inference' 'analysi':134 'analyt':124 'api':5,24,48,68,95 'attach':106 'avail':214 'base':8,27,58,79,86,171 'base usdc api' 'base-network' 'beyond':175 'bodi':241 'broader':116 'caller':104 'categori':120 'challeng':228 'classif':137 'classification' 'collect':42 'commit':101 'confirm':221 'connect':193 'convers':154 'crawl':217 'data':11,30,123,127 'data-analytics' 'decim':88 'detail':200 'difficult':236 'document':174,209,233 'embed':138 'embeddings' 'endpoint':16,35,49,62,122,157,219,254 'equival':89 'estim':148 'exampl':213 'exchang':143 'expect':249 'export':128 'extrem':180 'feed':142 'financ':13,32,139 'finance-data' 'four':119 'gas':147 'generat':155 'geocod':152 'geocoding' 'header':110 'host':40 'infrastructur':150 'insight':129 'key':96 'know':238 'l2':172 'lack':231 'land':177 'learn':132 'limit':98 'list':65 'live':222 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':131 'make':234 'metric':125 'micropayment api' 'network':59,173 'no-api-key' 'openapi':204 'page':178,188 'particular':252 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payment':54,73,109 'per':3,22,46,92,163 'platform':117 'post':113 'premium':67 'price':141,160 'product':253 'prompt':195 'proper':225 'protocol':55 'quot':146 'rate':97,144 'render':190 'report':126 'request':4,23,47,93,114,164,240 'request/response':207 'requir':71,103 'respons':246 'return':223 'schema':208 'send':243 'sentiment':133 'sentiment-analysis' 'settl':166 'shape':247 'simpli':105 'spars':181 'spec':205 'specif':61 'suit':6,25 'summar':136 'technic':199 'text':135 'text-summarization' 'token':145 'uniform':159 'unit':80 'upfront':100 'usag':212 'usdc':82,168 'usdc-settlement' 'util':15,34,151 'valid':153 'via':9,28,51 'wallet':194 'web3':140 'x402':10,29,53,108,227 'x402 api' 'x402-payment'","prices":[{"id":"c94226a6-8dde-492a-bff8-bced5ee02068","listingId":"55113133-dee3-4630-9d50-b0c5c5291cf9","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:40.026Z"}],"sources":[{"listingId":"55113133-dee3-4630-9d50-b0c5c5291cf9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:40.026Z","lastSeenAt":"2026-04-23T19:30:50.892Z"}],"details":{"listingId":"55113133-dee3-4630-9d50-b0c5c5291cf9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/44 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/44"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/44"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time finance data (prices, exchange rates, gas estimates) with per-call USDC micropayments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Integrating agent-driven workflows that settle each API call via x402 on Base"],"bestFor":["Agents or developers who want instant API access without registration or API keys","Low-volume or bursty workloads where per-call pricing is more economical than subscriptions","Crypto-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without volume discounts","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:22:58.053Z"},"updatedAt":"2026-04-23T19:30:50.892Z"}}